JP7057244B2 - Pipe fixture - Google Patents

Description

The present invention mainly relates to a pipe material fixing tool used when various pipes are attached to a bracket, a gantry or a steady rest.

In air conditioning equipment construction and sanitary equipment construction, various pipes are used according to the purpose and purpose, and when classified by material, they are roughly classified into metal pipes and resin pipes.

For example, a lining steel pipe whose inner surface is coated with polyethylene or hard polyvinyl chloride, or a resin pipe such as a hard polyvinyl chloride pipe or a polyethylene pipe is used for the water supply pipe, and a stainless steel pipe or heat resistant pipe is used for the hot water supply pipe. Hard polyvinyl chloride lining steel pipe is used.

When installing these pipes in a building, if it is a horizontal pipe, it can be hung from the ceiling or upper floor slab with a hanging band, as well as a bracket mounted on the wall or a gate-shaped stand installed on the floor. After mounting, fix it to these brackets and pedestals with U bolts, and if it is a rising pipe, fix it to the wall with a vertical band, or fix it to the steady rest attached to the wall surface with U bolts.

To fix the pipe using U-bolts, place the U-bolts on the pipes so that they straddle the pipes, and then insert the male screws formed at each end of the U-bolts into brackets, portal mounts, or bolt holes for steady rest. After that, a nut is screwed into the male screw, but in such fixing work, it is necessary to properly manage the torque of the nut so that an excessive tightening force does not act on the pipe from the U bolt. ..

Japanese Unexamined Patent Publication No. 9-296881

However, since the U-bolt has a circular cross section, it comes into contact with the pipe only on a curve along the circumferential direction of the pipe, and a tightening force by the U-bolt acts on the pipe along the curve.

Therefore, stress concentration is likely to occur in the piping, and even if the torque of the nut is not properly managed, even if the torque is properly managed, the piping is damaged or its durability is reduced due to the stress concentration. There was a risk of inviting.

When the pipe is a metal pipe, it is necessary to consider the corrosion protection of the pipe by electrically insulating it from the metal U-bolt, the bracket, the gantry or the steady rest. In addition, the peripheral surface of the U-bolt was coated with an electric insulating material, but even in such a case, the same problem as described above may occur.

In addition, when an inertial force during an earthquake acts on the pipe, the reaction force from the U-bolt acts intensively on the pipe along the above-mentioned circumferential curve, causing damage to the pipe and deterioration of durability. The problem gets even worse.

The present invention has been made in consideration of the above-mentioned circumstances, and provides a pipe material fixing tool capable of preventing damage or deterioration of durability of a pipe due to a tightening force at the time of fixing or a reaction force at the time of an earthquake. The purpose is to do.

In order to achieve the above object, as described in claim 1, the pipe material fixture according to the present invention has a bolt body having a circular cross section, a U-shape as a whole, and male screws formed in the vicinity of each end. And a load transmitting portion for transmitting a load between the bolt main body and a pipe material inserted and arranged in the inner space thereof, and the load transmitting portion is provided at least on the peripheral surface of the bolt main body. An annular base that is covered on the side of the inner space or is attached to the side of the inner space of the bolt body, and a lateral edge portion that is continuously integrated from the annular base in the material axis direction of the pipe material from the annular base. It is a pipe material fixing tool composed of an annular extension portion formed so as to project and having a band-shaped contact surface that abuts on the outer peripheral surface of the pipe material located on the side of the inner space. ,
The annular base is formed so as to cover the entire circumference of the bolt body.
The annular extension portion is extended in a state where the male screw is inserted into a fixed side member such as a bracket, a portal stand, a steady rest, etc. and a tightening torque is introduced by a nut screwed into the male screw. By configuring the male screw side end portion of the portion to be in contact with the fixed side member or the pedestal arranged therein, the tightening by the nut is restricted .

The pipe material fixture according to the present invention includes a bolt body having a U-shape as a whole and a load transmission unit for transmitting a load between the bolt body and the pipe material inserted and arranged in the inner space thereof. At the same time, the load transmission portion is composed of an annular base portion and an annular extension portion, and the annular extension portion is continuously integrated from the annular base portion and a side edge portion projects from the annular base portion in the material axis direction of the pipe material. The strip-shaped contact surface that abuts on the outer peripheral surface of the pipe material is formed so as to be located on the inner space side.

In this way, the load transmitted from the bolt body via the annular base acts on the outer peripheral surface of the pipe material via the band-shaped contact surface formed on the inner space side of the annular extension portion. However, since the strip-shaped contact surface becomes the loading surface, the contact area with the pipe material is significantly expanded compared to the conventional technique in which only the bolt body or the peripheral surface of the bolt body is covered with an electrical insulating material, and the bolt body. The load from is acting on the tubing in a dispersed state, in other words, on the tubing with less stress.

For example, in the case of fixing the pipe material, the tightening force from the bolt body is distributed from the loading surface to the outer peripheral surface of the pipe material so that the band-shaped contact surface formed in the annular extension portion becomes the loading surface. In the case of an earthquake, the reaction force against the inertial force at the time of the earthquake from the pipe material transmitted to the bolt body via the band-shaped contact surface is applied to the annular extension part as in the case of tightening. The formed band-shaped contact surface serves as a loading surface and acts in a state of being dispersed on the outer peripheral surface of the pipe material.

Therefore, it is possible to prevent stress concentration from occurring in the pipe material.

As described above, the load from the bolt body mainly corresponds to the tightening force at the time of installation and the reaction force at the time of an earthquake, but in addition to these, it is caused by vibration and temperature change due to fluid when the pipe material is piping. The reaction force of the load is applicable.

The load transmission portion is configured so that the load is transmitted between the bolt body and the pipe material, and as long as the annular base portion and the annular extension portion are continuously and integrally formed, what kind of material is formed? Although optional, a configuration made of a resin material such as polypropylene, polyethylene, or a thermoplastic elastomer is a typical example.

The shape of the annular extension portion is as long as the lateral edge portion is formed so as to project from the annular base portion in the material axis direction of the pipe material and a band-shaped contact surface that abuts on the outer peripheral surface of the pipe material is formed. Although optional, for example, a configuration formed in a semi-cylindrical shape, particularly a semi-cylindrical shape is a typical example.

If the width of the strip-shaped contact surface is too small, the load distribution effect cannot be sufficiently exerted in the annular extension portion, and if it is too large, the load is not sufficiently transmitted in the vicinity of the lateral edge of the strip-shaped contact surface. Therefore, it is desirable that the width of the strip-shaped contact surface is formed so as to be 1.5 times or more and 4 times or less the outer diameter of the bolt body, and is 2.5 to 3.5 times. It is even more desirable to do so.

Here, in the present invention, the male screw is inserted into a fixed side member such as a bracket, a portal mount, and a steady rest, and a tightening torque is introduced by a nut screwed into the male screw, and the annular extension is performed. Since the annular extension portion is configured so that the male screw side end portion of the portion is in contact with the fixed side member or the pedestal arranged therein, the nut screwed into the male screw of the bolt body is tightened. After the planned tightening torque is introduced, the male screw side end of the annular extension part comes into contact with the fixed side member and no further tightening is possible, so the tightening force acting on the pipe material. Can be prevented from becoming excessive.

The annular base is formed so as to cover the entire circumference of the bolt body . For example, a configuration in which the annular base is formed together with the annular extension by injection molding with the bolt body as an insert is a typical example, and in such a typical example, a resin is used. By appropriately selecting the material, in addition to the above-mentioned electrical insulation performance, rust prevention of the bolt body can be achieved.

The pipe material mainly corresponds to various pipes used for air conditioning equipment work and sanitary equipment work, but in addition to such pipes, if it can be used for fixing pipes, for example, these pipes are also used as pipe materials. Applicable.

In addition, when the pipe material is pipes, the pipe material is not limited to the one having a cylindrical cross section, but the one having a square cylinder cross section such as a square pipe is also included, and correspondingly, the bolt body. In addition to the U-bolt in the narrow sense in which the straight part is extended to the curved part of the semicircle, the U-bolt with such a shape is considered to be a U-shaped form even if the whole is U-shaped. (U-shaped bolt) is also included in the bolt body of the present invention.

The whole perspective view of the pipe material fixing tool which concerns on this embodiment. Similarly, it is a figure of the pipe material fixing tool which concerns on this embodiment, (a) is a front view, (b) is an arrow view seen from the direction of AA line, (c) is a sectional view along line BB. Similarly, it is a figure of the pipe material fixing tool which concerns on this embodiment, (a) is the arrow view from the direction of the CC line, and (b) is the view from the arrow seen from the direction of the DD line. The perspective view which showed the state of fixing the pipe which is a pipe material to a bracket by using the pipe material fixing tool which concerns on this embodiment. A cross-sectional view showing how a pipe, which is a pipe material, is fixed to a bracket by using the pipe material fixture according to the present embodiment. Explanatory drawing which showed the operation of the pipe material fixing tool which concerns on this embodiment. The perspective view which showed another fixing structure at the time of fixing a pipe to a bracket by using the pipe material fixing tool which concerns on this embodiment. The cross-sectional view which showed the pipe material fixing tool and its mounting structure which concerns on a modification. It is a figure which showed the pipe material fixing tool which concerns on another modification, (a) is the front view of the load transmission part used for the tube material fixing tool, (b) is the sectional view along the line EE, (c) is the figure. , Front view of the pipe fixture, (d) is a cross-sectional view along the FF line. It is a figure which showed the pipe material fixing tool which concerns on still another modification, (a) is the front view of the load transmission part used for the pipe material fixing tool, (b) is the sectional view along the GG line, (c). Is a front view of the pipe fixing tool, and (d) is a cross-sectional view along the HH line. It is a figure which showed the pipe material fixing tool which concerns on still another modification, (a) is a front view, (b) is a sectional view along line I-I.

Hereinafter, embodiments of the pipe fixing tool according to the present invention will be described with reference to the accompanying drawings. Parts and the like that are substantially the same as those of the prior art are designated by the same reference numerals and the description thereof will be omitted.

FIG. 1 is an overall perspective view showing the pipe material fixing tool according to the present embodiment, and FIGS. 2 (a) to 2 (c) are a front view of the pipe material fixing tool according to the present embodiment, and an arrow view taken along the line AA. And BB line cross-sectional view, FIGS. 3 (a) and 3 (b) are the CC line arrow view and the DD line arrow view of the pipe material fixing tool according to this embodiment, respectively. As can be seen from these figures, the pipe material fixture 1 according to the present embodiment includes a bolt body 2 and a load transmission unit 3.

The bolt body 2 has a circular cross section and a U-shape as a whole, and male screws 4 and 4 are formed in the vicinity of each end.

On the other hand, the load transmission unit 3 is configured to transmit a load between the bolt main body 2 and the pipe 5 as a pipe material inserted and arranged in the inner space 8 which is a space surrounded by the bolt main body, and is annular. It is composed of a base portion 6 and an annular extension portion 7.

The annular base 6 is formed in a cylindrical shape so as to cover the entire circumference of the bolt body 2 including the side of the inner space 8 on the peripheral surface of the bolt body 2 except for the forming portions of the male screws 4 and 4. be.

The annular extension portion 7 has lateral edge portions 9 and 9 projecting from the annular base 6 on opposite sides of the pipe 5 along the material axis direction, respectively, in the left-right direction in FIG. 2 (c), as a whole. It is formed continuously and integrally from the annular base so as to form a semi-cylindrical shape, and is injection molded using a resin material such as polypropylene, polyethylene, or thermoplastic elastomer with the bolt body 2 as an insert together with the annular base 6. Can be formed with.

When the pipe 5 is a metal pipe and the load transmitting portion 3 is made of an electrically insulating material made of a resin material such as polypropylene or polyethylene, the load transmitting portion 3 exhibits a function as an electrically insulating member. , The pipe 5 is electrically insulated from the bracket 41.

Of the annular extending portion 7, a surface located on the inner space 8 side, that is, a semi-cylindrical inner surface facing the inner space is formed as a strip-shaped contact surface 10 having a width W and a length L. The band-shaped contact surface comes into contact with the outer peripheral surface of the pipe 5.

Here, the width W of the annular extending portion 7 is the distance between the side edge portions 9 and 9 as shown in FIG. 2 (c), and the length L is as shown in FIG. 2 (a). The inner circumference along the semi-cylindrical inner surface. Further, in the annular extension portion 7, the central region sandwiched between the lateral edge portions 9 and 9 is shared with the portion extending toward the inner space 8 of the annular base portion 6.

If the width W of the strip-shaped contact surface 10 is too small, the annular extending portion 7 cannot sufficiently exert the load distribution action, and if it is too large, the load is applied in the vicinity of the lateral edge portions 9 and 9 of the strip-shaped contact surface 10. Since transmission may not be sufficiently performed, it is desirable that the width W of the strip-shaped contact surface 10 is formed so as to be, for example, 1.5 times or more and 4 times or less the outer diameter of the bolt body 2. , 2.5 times to 3.5 times is more desirable.

In order to fix the pipe 5 to the bracket 41 as a transverse pipe by using the pipe material fixing tool 1 according to the present embodiment, as shown in FIGS. 4 and 5, the electrically insulating plate 42 is attached to the installation surface 43 of the bracket 41. The pipe is placed so that the outer peripheral surface of the pipe 5 is brought into contact with the receiving seats 45 and 45 projecting at positions sandwiching the contact surface 44 of the electrically insulating plate 42 and the corresponding contact surface, respectively. Is placed on the bracket 41 via the electrically insulating plate 42.

Next, the pipe material fixing tool 1 is dropped from above the bracket 41 so as to straddle the pipe 5, and the male screws 4 and 4 provided on the bolt body 2 of the pipe material fixing tool are provided on the electrically insulating plate 42. It is inserted into the side bolt holes 46, 46 and the bracket side bolt holes 47, 47 provided in the bracket 41, respectively, and the band-shaped contact surface 10 of the annular extension portion 7 is brought into contact with the outer peripheral surface of the pipe 5.

Finally, the nuts 48 and 48 are screwed into the tips of the male screws 4 and 4, respectively, and these are tightened to fix the pipe 5 to the bracket 41.

In the pipe material fixture 1 according to the present embodiment, the load is transmitted between the bolt body 2 having a U-shape as a whole and the pipe 5 inserted through the bolt body and the inner space thereof. Along with providing a portion 3, the load transmission portion is composed of an annular base portion 6 and an annular extension portion 7, and the annular extension portion 7 is continuously integrated with the annular base portion 6 and has side edge portions 9 and 9. It is formed so as to project from the annular base portion in the material axis direction of the pipe 5, and the band-shaped contact surface 10 that abuts on the outer peripheral surface of the pipe 5 is formed so as to be located on the inner space 8 side. ..

In this way, the load transmitted from the bolt body 2 transmitted through the annular base 6 is piped through the strip-shaped contact surface 10 formed on the inner space 8 side of the annular extension portion 7. Although it acts on the outer peripheral surface of 5, the band-shaped contact surface 10 becomes the loading surface, that is, the contact area with the pipe 5 becomes the band-shaped area of width W × length L (FIGS. 2 (a) and 2 (c)). ), The load from the bolt body 2 acts on the pipe 5 in a dispersed state as shown in FIG. 6A, in other words, acts on the pipe 5 with a smaller stress or surface pressure.

Incidentally, in the case of the conventional technique in which only the bolt body or the peripheral surface of the bolt body is coated with an electric insulating material, the load from the U bolt 61 is the U bolt and the piping as shown in FIG. 6 (b). Since it acts on the pipe along the circumferential line 62 in contact with the 5, the load is placed on an extremely narrow area, and there is a concern about stress concentration.

More specifically, when the pipe 5 is fixed, the tightening force from the bolt body 2 is applied to the strip-shaped contact surface 10 formed on the annular extension portion 7, which is a loading surface. Therefore, it acts in a state of being dispersed from the loading surface to the outer peripheral surface of the pipe 5, and in the event of an earthquake, the inertia during an earthquake from the pipe 5 transmitted to the bolt body 2 via the band-shaped contact surface 10. With respect to the force (upward direction), the reaction force (downward direction) is dispersed on the outer peripheral surface of the pipe 5 with the band-shaped contact surface 10 formed on the annular extending portion 7 as a loading surface, as in the case of tightening. It works in a state of being.

The same applies to the horizontal seismic motion, and the reaction force (horizontal direction) is the reaction force (horizontal direction) with respect to the seismic inertial force (horizontal direction) from the pipe 5 transmitted to the bolt body 2 via the band-shaped contact surface 10. , The strip-shaped contact surface 10 acts as a loading surface and is dispersed on the outer peripheral surface of the pipe 5.

As described above, according to the pipe material fixing tool 1 according to the present embodiment, the contact area with the pipe 5 is significantly expanded as compared with the case of the prior art by the amount that the strip-shaped contact surface 10 becomes the loading surface.

Therefore, the load from the bolt body 2 acts on the pipe 5 in a dispersed state, and thus it is possible to prevent stress concentration from occurring in the pipe 5.

Further, according to the pipe material fixing tool 1 according to the present embodiment, since the entire circumference of the bolt body 2 except for the male screws 4 and 4 is covered with the annular base portion 6, the waterproof property of the bolt body is improved.

In the present embodiment, it is assumed that the pipe 5 is a metal pipe, and when fixing the pipe 5 to the bracket 41, the pipe 5 is connected to the bracket 41 via the electric insulation plate 42 so that the pipe is electrically insulated. However, if the target is the pipe 5a, which is a resin pipe, there is no need for electrical insulation, so the electrical insulation plate 4 may be omitted as shown in FIG.

Even in such a case, the action and effect related to the load distribution are surely exhibited as in the case of the above-described embodiment.

Further, in the present embodiment, the shaft portion of the bolt body 2 (the region where the male screw 4 is not formed) is completely covered with the annular base portion 6, and the male screw side of the annular base portion is exposed so that all the male screws 4 are exposed. Although the end portion has been positioned, how to set the length of the annular extension portion 7 along the material axis direction of the bolt body 2 is arbitrary, and the male screw 4 extends beyond the shaft portion of the bolt body 2. , 4 may be partially covered, or conversely, the shaft portion may be exposed.

Further, in the present embodiment, the annular base portion 6 and the annular extension portion 7 are configured so that the male screw side ends thereof are aligned, but these may not be aligned.

Further, although not particularly mentioned in the present embodiment, as shown in FIG. 8, the male screws 4 and 4 are inserted into the bracket 41 which is a fixing side member, and the nuts 48 and 48 screwed into the male screws are used. With the planned tightening torque introduced, the annular extension so that the male screw side end 81 of the annular extension 7 comes into contact with the electrically insulating plate 42 as a pedestal arranged on the bracket 41. You may configure the installation part.

According to this configuration, when the nuts 48 and 48 screwed into the male screws 4 and 4 of the bolt body 2 are tightened, after the planned torque is introduced, the male screw of the annular extension portion 7 is used. Since the side end portion 81 comes into contact with the electrically insulating plate 42 and cannot be further tightened, it is possible to prevent the tightening force acting on the pipe 5 from becoming excessive.

Further, in the present embodiment, the annular base portion of the present invention is composed of the annular base portion 6 which covers the entire circumference of the peripheral surface of the bolt body 2 except for the region where the male screws 4 and 4 are formed. Instead of this, as shown in FIG. 9, the annular base of the present invention is formed by the annular base 6a formed in a semi-cylindrical shape so as to be able to be fitted to the inner space 8 side of the bolt main body 2. In addition, the load transmission unit of the present invention may be configured by the load transmission unit 3a including the annular base portion and the annular extension portion 7.

In such a configuration, the semi-cylindrical annular base 6a is expanded in the radial direction and fitted into the bolt body 2, and after the fitting, the elastic restoring force of the annular base 6a that tends to shrink in the radial direction is used to transmit the load. The entire 3a may be held by the bolt body 2.

In this modification, the configuration is almost the same as that of the above-described embodiment except that the annular base portion 6 becomes the annular base portion 6a and the load transmission portion 3 becomes the load transmission portion 3a accordingly. Is almost the same, so a detailed description thereof will be omitted here.

Further, as shown in FIG. 10, the annular base portion of the present invention is composed of an annular base portion 6b formed so as to have a curved cross section, and a load transmission including the annular base portion and an annular extending portion 7. In addition to forming the load transmission portion of the present invention with the portion 3b, it is possible to adopt a configuration in which the annular base portion 6b and the annular cover portion 101 that can be freely connected to the annular base portion 6b are provided so as to sandwich the bolt body 2.

Here, the annular base portion 6b can be configured in a semi-cylindrical shape like the annular base portion 6a, but in this modification, the annular cover portion 101 is connected to the annular base portion 6b so as to sandwich the bolt body 2. Since the load transmitting portion 3b is held by the bolt main body 2, the annular base portion 6b does not need to be fitted to the bolt main body 2.

The cross section of the annular cover portion 101 may be appropriately determined so that the entire circumference of the bolt body 2 is covered together with the annular base portion in a state of being connected to the annular base portion 6b.

In such a configuration, unlike the modified example of FIG. 9, since the opposite side of the inner space 8 of the peripheral surface of the bolt body 2 is covered with the annular cover portion 101, it is waterproof as in the above embodiment in which the entire circumference is covered. It is possible to secure the performance.

Also in this modification, the configuration is almost the same as that of the above-described embodiment except that the annular base portion 6 is the annular base portion 6b, the load transmission portion 3 is the load transmission portion 3b, and the annular cover portion 101 is newly provided. Since the operation is almost the same, a detailed description thereof will be omitted here.

Further, in the present embodiment, the cylindrical pipe 5 is used as a pipe material, but instead, as shown in FIG. 11, a pipe material fixing tool 111 for a square pipe 115 having a square tube cross section is used as the pipe material. The pipe material fixing tool of the present invention may be used.

The pipe fixing tool 111 includes a bolt body 112 and a load transmitting portion 113, and the bolt body 112 has a circular cross section and a U-shape as a whole, and male screws 4 and 4 are formed in the vicinity of each end. It becomes.

On the other hand, the load transmission unit 113 transmits the load between the bolt main body 112 and the square pipe 115 as a pipe material inserted and arranged in the inner space 8 which is a space surrounded by the bolt main body. It is composed of an annular base 116 and an annular extension 117.

The annular base 116 is formed in a cylindrical shape so as to cover the entire circumference of the bolt body 112 including the side of the inner space 8 on the peripheral surface of the bolt body 112 except for the forming portions of the male screws 4 and 4. be.

The annular extension portion 117 is provided with lateral edge portions 9 and 9 projecting from the annular base 116 on opposite sides of the square pipe 115 along the material axis direction and in the left-right direction in FIG. 11 (b). It is formed continuously and integrally from the annular base so as to form a half-square cylinder as a whole, and injection using a resin material such as polypropylene, polyethylene, or thermoplastic elastomer with the bolt body 112 as an insert together with the annular base 116. It can be formed by molding.

Hereinafter, other configurations and actions and effects are almost the same as those of the above-described embodiment, and thus the description thereof will be omitted here.

1,111 Pipe fixing tool 2,112 Bolt body 3,3a, 3b, 113 Load transmission part 4 Male screw 5,115 Piping (pipe material)
6,6a, 6b, 116 Circular base 7,117 Circular extension 8 Internal space 9 Side edge 10 Band-shaped contact surface 41 Bracket (fixed side member)
42 Electrical insulation plate (pedestal)
48 Nut 81 Male thread side end 101 Circular cover

Claims (1)

To transmit the load between the bolt body, which has a circular cross section and a U-shape as a whole, and male threads are formed near each end, and the pipe material inserted through the bolt body and its inner space. The annular base is provided with the load transmitting portion of the above, and the load transmitting portion is coated on at least the inner space side of the peripheral surface of the bolt body, or is attached to the inner space side of the bolt body. And, the band-shaped contact surface that is continuously integrated from the annular base and has a side edge projecting from the annular base in the direction of the material axis of the pipe material and that abuts on the outer peripheral surface of the pipe material is inside. It is a pipe material fixing tool composed of an annular extension portion formed in a shape located on the side of the space.
The annular base is formed so as to cover the entire circumference of the bolt body.
The annular extension portion is extended in a state where the male screw is inserted into a fixing side member such as a bracket, a portal stand, a steady rest, etc. and a tightening torque is introduced by a nut screwed into the male screw. A pipe material fixing tool characterized in that the tightening by the nut is restricted by configuring the male screw side end portion of the portion to be in contact with the fixing side member or the pedestal arranged therein. ..

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